To elborate a little further, they both should spin up close to the same RPM, but think of longer lower pitch props as a low gear. Lower top speed, but more pulling power. hink of a higher pitched prop as a higher gear, more top speed, not quite as much straight up pulling power. You might get a little more spool up time, or lag on the longer prop. You jam it to full throttle and it might take a little longer to reach full speed.

Hope this info helps.